Automobile-jack



B. MULVANE.

AUTOMOBILE JACK.

APPLICATION FILED FEB. 18, 1920.

1,380,405. Patented June 7, 1921.

I awmmiioz Ear-1 MuLvane MOT/M 943 UNITED STATES V PATENT. OFFICE.

BERT MULVANE, 0F CLEVELAND, OHIO.

AUTOMOBILE-JACK.

Specification of Letters latent.

Patented June'7, 1921.

Application filed February 18, 1920. Serial No. 359,724.

and useful Improvements in Automobile- Jacks, of which the following is a specification.

This invention relates to jacks, and the primary object of the invention is to provide an improved jack embodying a plural ity of pivotally connected levers, 50 arranged as to obtain a compound leverage, whereby the load can be easily and quickly lifted with a minimum amount of exertion on the part of the operator.

Another object of the invention is to provide an improved quick action automobile jack of the lazy tong type having a head for engaging the vehicle'axle or other load to be lifted and an operating foot lever having means for locking the jack i an adjusted position.

A further object of the invention is to provide an improved jack embodying the lazy tong principle in which the lazy tong arms or levers are pivotally connected together adjacent to their upper terminals so as to increase the leverage of the jack and thereby permit the easy operation thereof.

A further object of the invention is to provide an improved jack having a lever adapted to be operated by the foot, thereby eliminating the necessity of the operator leaning over to operate the jack, the lever having locking pawls pivotally connected thereto for holding the jack in any adjusted position, the pawls being adapted to be operated by the foot.

A still further object of the invention is to rovide an improved foot actuated automobile jack of the above character which is durable and eflicient in use, one that is simple and easy to manufacture, and one which can be placed upon the market at a reasonable cost.

Other objects 'of the invention will appear in the following detailed description taken in connection with the" drawings, forming a part of this specification, in which draw in s:

Tigure 1 is a side elevation of the improved jack. a

Fig. 2 is a vertical longitudinal sectlon through the same, and

Fig. 3 is a fragmentary plan View .of

the jack showing the improved operating lever.

Referring to the drawings, in detail, wherein similar reference characters designate corresponding parts throughout the several views, the numeral 5 generally indi-' cates the improved jack, which includes the adapted to rest upon the ground or other surface, which the jack is placed upon. The

upper surface of the base plate 6 adjacent.

to its terminal is provided with upstanding studs 7, having outwardly extending feet 8, which are riveted or otherwise secured to the base plate 6 as at 9. The studs 7 have secured thereto by suitable pivot pins 10 the upwardly and inwardly extending oppositely disposed arms 11 and 12, which are pivotally connected at their upper ends by pivot pins 13, to the lower terminals of the lowermost pairs of the lazy tong arms or levers 14. The arms 12 are preferably made up of two straight members which engage on opposite sides of the studs 7 to form a guide for-the operating lever 15 which will be hereinafter more fully described, and are provided with outer rack faces 16 which are adapted to be engaged by the pawl 17 pivotally connected as at '18 to the operating lever intermediate its ends. The inner end of the operating lever 15 is pivotally connected as at 19 at its inner end to a stud 20, which is riveted or otherwise secured to the upper surface of the base plate 6 adjacent to the arm 11, and the pivot pin 19 forms the fulcrum point for the operating lever. The lever 15 adjacent to its pivot point is provided with an upstanding enlargement 21, which carries a pivot pin 22, to which is connected the relatively short link 23, which in turn is connected'by means of a pin 24 to the inner overhanging terminals of the upwardly extendin oppositely inclined connecting links 25. T e outer terminals of the connecting links 25 are pivotally mounted on the pins 13 and form means for operatively connecting the lever 15 with the lazy tong arms or levers 14 for raising and lowering the jack.

The lazy tong arms or levers 14 are ar ranged in pairs in the ordinary manner and relatively long flat base plate 6, which is decrease in length asthey reach the upper end of the jack. The lazy tong arms or levers 14 of each pair are pivotally connected together by means of pivot pins 26 and these pivot pins are arranged ad acent to the upper terminals of the arms, so as to increase -or levers 14 are pivotally connected together by suitable pivot pins or the like 27, and these pivot pins and the other pivot pins connecting the portions of the jack are formed relatively heavy and may be provided with suitable anti-friction sleeves so as to render the operation of the jack relatively easy. The arms or levers 14 on one side of the jack of each pair of the arms include two spaced members indicated by the numeral 28 as clearly shown in Fig. 2 of the drawings, and the arms on the opposite side of the jack of the pairs of the arms extend through the members 28 forming the other arms. The upper terminals of the uppermost pairs of arms or levers 14: carry pivot pins 29 which are slidably mounted in slots 30 formed in the dependlng flange 31 of the jack head 32. The head 32 has its terminals flared upwardly as at 33 so as to prevent the slipping of the work OK of the same. The pawl 17 has its upper endvprovided with a right angularly extending extension 3l which overlies the upper surface of the operating lever 15 and the forward end of the right angular extension 34 is adapted to engage the teeth of the rack faces 16. 'The pawl 17 directlyjabove 'the pivot pin 18'has pivotally connected thereto the connecting link 35 which extends longitudinally along the operating lever 15 and is pivotally connected to the pawl actuating lever 36 which is pivotally connected as at 37 to the operating lever. The extreme outer end of the operating lever 15 has pivotally connected thereto, as at 38, the foot plate 39 on which the operator is adapted to place his foot when the jack is to be operated.

In operation of the improved jack, the head 32 is placed in engagement with the work to be lifted and the foot of the operat )r is placed upon the plate 39 in such a manner as to permit the forward end of his footto engage the operating lever 36 so as to swing the pawl 17 out of engagement with the rack faces 16. Pressure is then applied to the lever in a downward direction which .will

raise the lazy tong arms or levers 14; up-

wardly. The operator may release pressure from the pawl operating lever 36 at any desired time so as to permit the pawl 17 to drop by gravity into engagement with any one of the teeth of the rack faces 16 for locking theijack in any adjusted position. The arrangement of the lazy tong arms or levers and the means for pivotally connecting the same together permits the load to be lifted in a convenient and expeditious manner with a minimumamount of exertion on the part of the operator. I

From the foregoing description it can be ma e-cs seen that an improved jack isprovided of exceptionally simple and durable construction which will effectively accomplish the purpose intended.

- Changes in details may be made without departing from the spirit or scope of the invention; but,

. I claim:

1. A jack comprising a base plate, a plurality of pairs of superposed crossed levers pivotally connected at the points of intersection, means pivotally connecting the meeting terminals of the pairs of leverstogether, the pairs of levers being gradually decreased in length toward the upper end of the jack, a head carried by the outer terminals of the uppermost pair oflevers, an operating lever pivotally connected to the base plate, and means pivotally connecting the operating lever intermediate its ends to the lowermost pair of levers.

2. A jack comprising a base plate, a plurality of pairs of superposed crossed levers pivotally connected at the points of intersection, a head slidably and pivotally connected to the outer terminals of the uppermost pair of levers, a foot lever pivotally connected to the base plate, means operatively connecting the operating lever intermediate its ends to the lowermost pair of crossed levers and foot operated for locking the operating lever in any adjusted position.

3. A jack comprising a base plate, a plurality of pairs of superposed crossed levers connected at the points of intersection, means pivotally connecting the meeting terminals of the levers together, a head pivotally and slidably carried by the outer terminals of the uppermost pair of levers, a foot lever pivotally connected to the base plate, ineans operatively connecting the operating lever intermediate its ends with the lowermost I pair of levers, and a foot operated dog carried by the operating lever arranged to lock the operating lever in any adjusted position.

4. jack comprising a base plate, a plurality of superposed pairs of crossed levers pivotally connected at the points of intersection, a head slidably and pivotally carried by the outer terminals of the uppermost pair of cross levers, arms pivotally connecting the lower terminals of the lowermost pair of cross leversto the base plate, an operating lever pivotally connected-to the base plate rality of pairs of superposed levers, means pivotally connecting the meeting terminals of the levers together, a work engaging head, means pivotally and slidably connecting the head to the upper terminals of the uppermost pair of levers, arms pivotally connected to the base plate and to the lower terminals of the lowermost pair of levers, inwardly extending links pivotally connected to the lower terminals of the lowermost pair of levers, an operating lever, means pivotally connecting the inner-end of the operating lever to the base plate, intermediate the arms, and links pivotally connecting the first mentioned links together and to the lever intermediate its ends, one of the arms hav-- ing a rack face formed thereon, a pawl pivotallycarried by the lever and arranged to engage the rack face, a foot plate carried by the outer terminal of the lever, a pawl operating lever connected to the first mentioned lever and arranged in front of the foot plate, and a link pivotally connecting the pawl and the pawl operating lever together.

BERT MULVANE; I 

